Displaying organisation hierarchy

Hi Experts,
Developing in C# and SQL.
Retrieving data from a Employee Table which ahs EmployeeName and SupervisorName as 2 fields.
I have a panel in my aspx page and need to  show the employeeName in a hierarchical manner with check boxes so the user can select the desired employees.
Eg:
Supervisor
     Subordinate 1
          Subordinate A
          Subordinate B
     Subordinate 2
     Subordinate 3
           Subordinate C
           Subordinate D
                   Subordinate D1
&nb ...